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mm/migration: add trace events for THP migrations 

Patch series "mm/migration: Add trace events", v3.

This adds trace events for all migration scenarios including base page,
THP and HugeTLB.

This patch (of 3):

This adds two trace events for PMD based THP migration without split.
These events closely follow the implementation details like setting and
removing of PMD migration entries, which are essential operations for THP
migration.  This moves CREATE_TRACE_POINTS into generic THP from powerpc
for these new trace events to be available on other platforms as well.

Link: https://lkml.kernel.org/r/1643368182-9588-1-git-send-email-anshuman.khandual@arm.com
Link: https://lkml.kernel.org/r/1643368182-9588-2-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Anshuman Khandual 2022-03-24 18:09:58 -07:00 committed by Linus Torvalds
parent 5d543f13e2
commit 283fd6fe05
3 changed files with 32 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/powerpc/mm/book3s64/trace.c
View File

@ -3,6 +3,5 @@
* This file is for defining trace points and trace related helpers.
*/
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define CREATE_TRACE_POINTS
#include <trace/events/thp.h>
#endif

27
include/trace/events/thp.h
View File

@ -48,6 +48,33 @@ TRACE_EVENT(hugepage_update,
TP_printk("hugepage update at addr 0x%lx and pte = 0x%lx clr = 0x%lx, set = 0x%lx", __entry->addr, __entry->pte, __entry->clr, __entry->set)
);
DECLARE_EVENT_CLASS(migration_pmd,
TP_PROTO(unsigned long addr, unsigned long pmd),
TP_ARGS(addr, pmd),
TP_STRUCT__entry(
__field(unsigned long, addr)
__field(unsigned long, pmd)
),
TP_fast_assign(
__entry->addr = addr;
__entry->pmd = pmd;
),
TP_printk("addr=%lx, pmd=%lx", __entry->addr, __entry->pmd)
);
DEFINE_EVENT(migration_pmd, set_migration_pmd,
TP_PROTO(unsigned long addr, unsigned long pmd),
TP_ARGS(addr, pmd)
);
DEFINE_EVENT(migration_pmd, remove_migration_pmd,
TP_PROTO(unsigned long addr, unsigned long pmd),
TP_ARGS(addr, pmd)
);
#endif /* _TRACE_THP_H */
/* This part must be outside protection */

5
mm/huge_memory.c
View File

@ -40,6 +40,9 @@
#include <asm/pgalloc.h>
#include "internal.h"
#define CREATE_TRACE_POINTS
#include <trace/events/thp.h>
/*
* By default, transparent hugepage support is disabled in order to avoid
* risking an increased memory footprint for applications that are not
@ -3131,6 +3134,7 @@ void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
set_pmd_at(mm, address, pvmw->pmd, pmdswp);
page_remove_rmap(page, vma, true);
put_page(page);
trace_set_migration_pmd(address, pmd_val(pmdswp));
}
void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new)
@ -3163,5 +3167,6 @@ void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new)
/* No need to invalidate - it was non-present before */
update_mmu_cache_pmd(vma, address, pvmw->pmd);
trace_remove_migration_pmd(address, pmd_val(pmde));
}
#endif